Tena on S-string

As a result of an accident, Kyousuke, a music college student, becomes able to see 'the notes of life,' which surround all people. One day, he's suddenly confronted by a girl in Gothic Lolita garb named Tena, who asks him to become her possession. Since then, the cogs of Kyousuke's life have been turning...but for better or for worse? (Souce: Yen Press)